Duplicating-machine.



H. G. LIEBENTHAL. DUPLIGTING MACHINE. APPLICATION FILED JUNE 2. 1913.

INVENTOR:

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` H.G.L1BBBNTHAL.`

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4member of the lprinting couple.

UNITED f STATES PATENT oEEIcE.

HERMAN G. LIEBENTHAL, oF PHILADELPHIA, PENNSYLVANIA, AssIGNoR To KATHERINE E. OKANE, OEPHILADELPHIA,

PENNSYLVANIA.

DUPLIGATING-MACHINE.

Specification of Letters Patent. vPatented Allg. 12,1913.

Original application iiled April, 21, 1913,4 Serial Nd. 762,643. Dividedrand this application led June 2,

` 1913. Serial No. 771,200.

tion, reference being had to the accompanyf.

ing drawings. E

My improvement is particularly applicable to printing machines of the type known commercially as the Multigraph comprising a rotary printing cylinder having a series of undercut channels in its perimeter extending parallel with its axis to receive complement-ary shaped flanged type which said cylinder presents in opposition to the other As ordinarily constructed,I the printed impressions from such a machine arevirregular in accordance with the length of. the lines of type; because the lines of type extend par-l allel with the axis of theprinting cylinder and are .successively pressed between the printing1 couple with a given pressure which, being the same for each line, is 1. variable per unit of length of the line. {or instance, a line one-half the length of he cylinder would be printed'with a pressure, per unit of length of that line double the pressure per unit of length of a line which is the full length of the cylinder,and consequently the shorter the lines the more deeply anddarkly they are printed.

Therefore, it is the objec l of my rinvention to providesuch a machiniif with means to equalize the pressure per unit of area upon the successivelines of type in compensation for variations in the-length of the lines; so

that the printed impressions made 'from successive lines shall be uniform in depth and' darkness ,regardless of differences in thek length of said lines.

My invention rovides means interposed between the coup e at the short lines to sustain `a portion ofv theY printing pressure which would otherwise be concentrated on said short lines, and, ashereinafter described,

such devices -include detachable cam elements which may be fitted in the type channels in the printing drum, or otherwise applied to the latter, to bear upon a pair of bearing rollers carried by the platen shaft concentric with its axis. For instance, the

have chosen combination of a platen duplicating machine which I for illustration includes the With a rotary printing drum;

shaft extending parallel with the axis of said printing drum; an eccentric on said shaft; a platen roller journaled on said eccentric; a pair of bearing rollers carried by said shaft concentric with its axis; clutch means connecting said bearing rollers for rotation with said platen roller; detachable cam members on said-printing drum; arranged to bear upon said bearing rollers;

including an element having recesses in its periphery extending parallel with the axis of said printing drum, and elements detachably fitted in said recesses to project beyond the printing faces of the printing elements on said drum; and means whereby said shaft maybe turned to adjustably vary the distance between the axes of said print-ing drum and platen, without varying the distance between the axes of said printing drum and bea-ring)e rollers; whereby the printing pressure tween said V,drum and platen may be variablyi predetermined to be different at dierentv regions'of the circumference of'said drum. Said construction includes the clutch means aforesaid because the platen is positively driven so as to turn synchronously with the printing drum. I-Iowever, if the bearing rollers are not included in the driving means of the platen, said clutch means may be omitted.

My invention comprises the various novel features. of construction and arrangement hereinafter more definitely specified.

In the drawings; Figu tarya vertical longitudinal sectional view of a portionvof a Multigraph machine including a. convenient form of my invention. Fig. II is a fragmentary 'transverse sectional view, taken on the line II, II in Fig. I. Fig. III is a fragmentary transverse sectional view, taken on the line III, III in Fig. I. Fig. IV is a fragmentary longitudinal sectional view of a portion of the printing drum shown in Fig. I, but on a larger scale, showing the arrangement of my invention in connection therewith. Fig, V is a fragmentary transverse sectional view of sai drum taken on the line V, V in Fig. -IV. Fig. VI is a fragmentary transverse sectional view of said drum" taken on the line VI, VI in Fig. IV. Fig. VII is a perspecre I is a fragmen- Y Aform of my invention.

tive view of one of the detachable cam ineinbers shown in ltlig. Vl. Fig. Vlll is a 'fragmentary transverse sectional View of said drum taken on the line V111', Vlll in Fig. lV. Fig. 1X is a fragmentary trans verse sectional view ot' a printing drum similar to Fig. V1 but showing a modified Fig. X is an elevation of one of the cam type.

lin said igures; 65 indicates the traine of a Multigraph machine having bearings G0 and 67 for the shaft G8 of the rotary drum 69 having the curved surface 7 undercut channels 72 therein. Said drum 69 is provided with means for moving said surface 7l. about its center of curvature, inA eluding the handle 74 connected with said shait 68. rlhe platen shaft 75 being journaled in the bearings 77 and 7S in said traine (35, extends parallel with the axis of said printing .drum and has the eccentric 80 on which is journaled the cylindrical platen roller 81 having the face 82 of resiliient material. Saidvbearing 78 is a rotary eccentric having the lever arm 84 slotted to receive the screw 85 by which it may be secured in adjusted position, so that the dis tance between the axes o't said drum 09 and platen roller shaft 75 may be precisely determined. Said shaft 75 carries the pair ot' bearing rollers 87 and 88 which are journaled on the respective rotary eccentric bearings 90 and 91 which are rigidly connected by the bar 92, shown in Figs. ll and Hl, so that they may be simultaneously turned on said shaft 75 bv the lever arm 90 shown at` the left hand side or' Fig. l and in Fig. lill, having the slot 97 for the screw 9S by which it. may be secured in adjusted position, so that the distance between the axes of said drum 69 and said rollers 87 and 88 may be precisely determined, and varied, without changing the position ol the axis of said-` platen roller shaft 75. Said bearing rollers 87 and 88 are respectively provided with clutch means connecting them for rotation with said platen roller 81 and including the crown lugs 99 and 100 respectively fitting in the recesses 101 and 103 at the opposite ends of said platen 81. Said drum 69 is provided with the driving gear 105 engaging the platen gear 10G which is supported by said shaft 75 but journaled on the portion 107 of said eccentric 90, which portion is concentric with the axis of said shaft. Clutch means are provided operatively connecting said platen gear 106 with said bearing roller 87 including the crown lugs 109 on said roller 87 fitting the recesses 110 in said platen gear. lt is to be understood that the arrangement last above described is such that when said drum 69 is turned to move its surface 71 about its center of curvature, to Wit, the axis of said shaft 68, said plat/en 8l is correspondingly novo 1 with the' moved; said bearing roller 87 Vserving as a coupling between said platen gear 10G and the platen .31, although said roller and platenare rotatable upon respectively ditferent axes in eccentric relation with each other.

it may be observml that the construction above described provides said bearing rollers with means to precisely adjust the distance between their axes and the axis of the printing drum withoutehanging the position of the platen roller shaft upon which said rollers are supported. However, a forni ot my invention wherein the only means for determining the precise distance between the axes of the printing drum and the bearing rollers are adjustable bearings at the opposite ends of the platen roller shaft upon which said bearing rollers are mounted is claimed in my application Serial gti-762,643, tiled April 2l, 1913 for Letters lPatent of the United States for iniprovelnent in duplicating machines of which this application is a division. Such adjustment is used to vary the printing pressure between the resilient surface 82 of said platen roller 81 and the printing faces of the type a0 which, as shown in lltig. V, have flanges 41 tting said undercut channels 72 in the curved face 71 ot' said drum 69. Such variation in the printing pressure is effected to vary the depth of' the impression oi" the print-ing faces of said type a0 with respect to the paper et-Q, through the inking ribbon 43 which is interposed between said paper and said faces as shown in Fig. l. 1n order to equalize the pressure per unit of area upon the successive lines of said printing type 40 in compensation for variations in the lengt-h of said lines, 'l interpose between said curved surface 71 of the drum 69 and the opposed surface 82 of the platen 81 a cam element or elements carried by said drum at its surface 71. Said cam element may be a cam type 4:5 having flanges 46 fitted to said channels 72 like the printing type 40 but having a bearing face project-ing beyond the printing face of said type 40, as shown in Fig. V. Although said type 45 only extends in alinement with'one line of type 40; it is to be understood that such cam type may be made to bridge two or ymore of the lines of said type 40; for instance, as shown in Fig. VH1 the cam type 48 extends transversely with respect to ve of the channels 72 and has the flange 49 fitting in each of said channels. However, it is to be understood` that such bridge cam type may be made to extend transversely with respect to several of the channels 72 without having flanges 49 engaged With all of them; such flanges. in two places on such ay bridge cam type being suli'icient to hold the latter in adjusted position. As shown at the right hand end ot channels 72, such cam type 45 (or 48) may bear directly upon the opposed platen surface 82. However, as above described, said platen surface is resilient and' consequentlyA such an arrangement would n ot positively determine the radial extent of the space between the opposed surfaces of the printing couple. l Of course, said platen roller 8l may be provided with rigid zones serving as bearings in opposition to the cam typeaforesaid; but such arrangement would limit the longitudinal extentV of the platen available for printing purposes, particularly at the right hand end ofthe channels 72, as indicated in Fig. I. Therefore, it is preferable to locate said cam type 45, etc., at the left hand end of the drum 69, in opposition to the rigid bearing roller 88, as shown in Fig. I, vand to provide cam elements arranged to be removably set in opposition to the bearing roller 87 at the right hand end of the drum 69, as shown in Fig. I.

As ordinarily constructed the Multigraph machine has a `cylindrical recess 5l at the circumference of the drum 69, at the right hand end thereof, as indicated in Fig. I, and I secure therein a cam device opposed to the bearing roller 87 and 'ncluding the sectoral cam rack 52 which is rigidly connected with said drum 69, convenient-ly by screws 53 at the opposite ends ofsaid rack,one of which is indicated in Fig. VI. As shown in Fig. VI said cam rack 52 has recesses 55 which are undercut for engagement with the de tachablecam type 56 which are conveniently formed of pressed sheet metal and so proportioned that they project radially with respectto the drum 69 beyond the printing faces of the printing type 40 to the same eX- tent as the'cam type 45 and\48 above described. Referring to Fig. VI it may be observed that said recesses 55 are of such circumferential `extent as to only leave at the perimeter of the cam rack 52 the circumferentially undercut projections 58 to be embraced by the removable cam type 56. However, it is'to be understood that suitable recesses to receive andlholld such cam type may be otherwise formed; for instance, as shown in Fig. IX, the recesses 60 which engage the cam type 56 are merely sawcuts in the perimeter of the rack.

It is to be understood that the cam de vices including the racks 52 above described are mere expedients to fit the duplicating machines as now on the market, and that a simpler arrangement wouldbe to extend the drum channels 72 in opposition tothe bearing roller 87 above described so that the cam type 45 may be set in opposition to said roller like the printing type 40. Moreover, although I prefer to employ bearing rollers in opposition to the cam elements on the printing drum to limit the depth of the printing impression of the printing type, as above described; it is to be understood that 4tion with a member having other means may be arranged to coperate with'said cam elements for that purpose.

I do not desire to .limit myself It-o the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention as defined inthe appended claims.

l. In a duplicating machine, the combinavtionwith a member having a: surface formed to carry rows of type; of a platen coperating with said surface means arranged to variably limit the depth of printing impression of said type with respect to said platen, including cams detachably carried at said surface in spaced relation with each other, bearing rollers opposed to 'said cams. a normally stationary shaft supporting said rollers, having an eccentric bearing for said platen, means whereby said shaft may be adjustably turned, rotary eccentric bearings interposed between said rollers and said shaft, means rigidly connecting said bearings, whereby they may be simultaneously turned on said shaft, including a lever arm; and means whereby said lever arm may be secured in adjusted position.

2. In a duplicating machine, the combination witha member having a surface formed to carry rows of type; of a platen coperating with said surface; means arranged to variably limit the depth of printing impression of said ltype with respect to said platen, including cams detachably carried at said surface in spaced relation with each other, bearing rollers opposed to said cams, a shaft supporting said rollers, rotary eccentric bearings interposed between said rollers and said shaft, means rigidly connecting said bearings, whereby they may `be simultaneously turned ori-,said shaft, in-

cluding a lever arm; and means whereby said lever arm may be secured in adjusted position.

3. In a duplicating machine, the combination with a member having a surface formed to carry rows of type; of a platen coperating with said surface; means -arranged to variably limit the depth of printing impression of said type with respect to said platen, including cams detachably carried at said surface in spaced relation with each other', bearing rollers opposed to said cams,

a shaft supporting said rollers, and rotary eccentric bearings interposed between said rollers and said shaft.

4. In a duplicating machine,

` a surface formed to carry rows of type; of a platen coperating with said surface; means arranged to limit the depth of printing impression of said type with respect to said platen, in-

cluding a cam carried at said surface, a

bearing roller opposed to said cam, a shaft the combinasupporting said roller` and a rotary eccentric bearing interposed between said roller and said shaft.

5. In a duplicating machine, the combination with a platen; of a member having a surface with a recess in its periphery; a printing type fitted to said recess; a cam type fitted to said recess and having a bean ing face projecting beyond the printing face of said other type; and means arranged to copeate with said cam type to limit the depth of printing impression ofsaid printing type with respect to said platen, including a bearing roller and eccentric bearing means for said roller adjustable toward and away from said surface.

6. .ln a duplicating machine, the combination with a member having a surface'formed to carry rows of type; of a rotary platen cooperating With said surface; means arranged to limit the depth of impression ot' said type with respectto said platen, includ ing a cam at said surface and a bearing rolleil adapted to coperate with said cam; a shaft supporting said platen and bearing roller; means whereby said platen and bearing roller are independently adjustable toward and away from said surface, including relatively rotatable eccentrics on said shaft, respectively supporting said platen and said t bearing roller, and levers whereby said eci centrics may be respectively, turned; and;` means whereby said levers may be secured in l adjusted position.

7. ln a duplicating machine, the combination with a member having a surface formed to carry rowsA of type; of a rotary platen cooperating with said surface; means arranged to limit thc depth of impression ot said type with cluding a cam at said surface and a bearing roller adapted to coperate with said cam; a shaft supportingsaid platen and bearing roller; and means whereby said platen and bearing roller are independently adjustable toward and away from said surface, including relativelyrotatable eccentrics on said shaft, respectively supportingl said platen and said bearing roller.

8. In a duplicating machine, the combination with a member having a surface formed to carry rows of type; of a platen coperating with said surface; means arranged to limit the depth of impression of said type with respect to said platen, including a cam at saidsurt'ace and a bearing roller adapted to coperate with said cam; a shaft; and means whereby said platen and bearing roller are independently adjustable toward and away from said surface, including relatively rotatable eccentrics on said shaft.

ln testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this 29th day of May, 191B.

HERMAN G. LlEBENTl-IAL. Witnesses:

ARTHUR E. PAIGE, lE'rHEL M. liiscnwmLnR.

respect to said platen, inc 

